Navigate Up/Down in dropdownEditor trigger change cell focus and close the dropdownEditor. Only happened in Firefox & IE.

[chungvinhkhang]

Navigate Up/Down in dropdownEditor trigger change cell focus and close the dropdownEditor. Only happened in Firefox & IE.

Sample: http://ui-grid.info/docs/#/tutorial/309_editable_with_cellnav

1. Click on any Gender cell and got cell focused and turn to dropdowneditor
2. Press space or click to open the list
3. Press down/up

Current: cell changed focus and close the dropdownEditor
Should be: changed the selection of drop down

Env: firefox, ie on windows 7

Any solution for this case?
Thanks